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extern crate log; extern crate time; use log::{Log, LogLevelFilter, LogMetadata, LogRecord, SetLoggerError}; use std::fs::OpenOptions; use std::io::Error as IoError; use std::io::Write; use std::path::PathBuf; use std::sync::mpsc::{SyncSender, sync_channel}; use time::{get_time, Timespec}; #[derive(Clone, Debug)] enum LoggerInput { LogMsg(String), Quit, } pub struct Logger { format: Box<Fn(Timespec, &LogRecord) -> String + Sync + Send>, level: LogLevelFilter, queue: SyncSender<LoggerInput>, worker_thread: Option<std::thread::JoinHandle<()>>, } unsafe impl Send for Logger {} unsafe impl Sync for Logger {} impl Logger { #[inline] fn max_log_level(&self) -> LogLevelFilter { self.level } pub fn init(self) -> Result<(), SetLoggerError> { log::set_logger(|max_log_level| { max_log_level.set(self.max_log_level()); Box::new(self) }) } } impl Log for Logger { #[inline] fn enabled(&self, metadata: &LogMetadata) -> bool { self.level >= metadata.level() } fn log(&self, record: &LogRecord) { let log_msg = (self.format)(get_time(), record); self.queue .send(LoggerInput::LogMsg(log_msg)) .expect("logger queue closed when logging, this is a bug"); } } impl Drop for Logger { fn drop(&mut self) { self.queue .send(LoggerInput::Quit) .expect("logger queue closed before joining logger thread, this is a bug"); let join_handle = self.worker_thread .take() .expect("logger thread empty when dropping logger, this is a bug"); join_handle.join() .expect("failed to join logger thread when dropping logger, this is a bug"); } } pub struct LogBuilder { format: Box<Fn(Timespec, &LogRecord) -> String + Sync + Send>, capacity: usize, level: LogLevelFilter, path: PathBuf, header: Vec<String>, } impl LogBuilder { #[inline] pub fn new() -> LogBuilder { LogBuilder { format: Box::new(|ts: Timespec, record: &LogRecord| { format!("{:?} {}:{}: {}", ts, record.level(), record.location().module_path(), record.args()) }), capacity: 2048, level: LogLevelFilter::Info, path: PathBuf::from("./current.log"), header: Vec::new(), } } #[inline] pub fn format<F: 'static>(&mut self, format: F) -> &mut LogBuilder where F: Fn(Timespec, &LogRecord) -> String + Sync + Send { self.format = Box::new(format); self } #[inline] pub fn capacity(&mut self, capacity: usize) -> &mut LogBuilder { self.capacity = capacity; self } #[inline] pub fn file(&mut self, path: PathBuf) -> &mut LogBuilder { self.path = path; self } #[inline] pub fn max_log_level(&mut self, level: LogLevelFilter) -> &mut LogBuilder { self.level = level; self } #[inline] pub fn header(&mut self, header: Vec<String>) -> &mut LogBuilder { self.header = header; self } pub fn build(self) -> Result<Logger, IoError> { let (sync_sender, receiver) = sync_channel(self.capacity); let mut writer = try!(OpenOptions::new() .create(true) .append(true) .open(self.path)); for line in &self.header { try!(writeln!(&mut writer, "{}", line)); } let worker_thread = try!(std::thread::Builder::new() .name("logger".to_string()) .spawn(move || loop { match receiver.recv() { Ok(LoggerInput::LogMsg(msg)) => { writeln!(&mut writer, "{}", msg).expect("logger write message failed"); } Ok(LoggerInput::Quit) => { break; } Err(_) => { panic!("sender closed without sending a Quit first, this is a bug"); } } })); Ok(Logger { format: self.format, level: self.level, queue: sync_sender, worker_thread: Some(worker_thread), }) } }